As far as I know Direct X doesn't do bacface removal, I believe Direct X can do view frustrum clipping using the six planes, but I don't think it does back-face removal.
I think everybody gets mixed up with backface culling , counter clockwise or clockwise culling ... in Blitz you can have the backface of a triangle drawn, so both sides of the triangle are textured and drawn. By default Blitz uses CCW culling ( counter clockwise), so triangles rendered in CW (clockwise) order will only be shown.
I think everybody gets mixed up with backface culling , counter clockwise or clockwise culling ... in Blitz you can have the backface of a triangle drawn, so both sides of the triangle are textured and drawn. By default Blitz uses CCW culling ( counter clockwise), so triangles rendered in CW (clockwise) order will only be shown.